陕北地区退耕还林十年植被恢复变化分析——以子长县为例

Variations of Vegetation Rehabilitation of 10-Year Returning Farmland to Forest of Northern Shaanxi

以2000年和2010年ETM+遥感数据为数据源,借助ArcGIS和ERDAS软件平台对子长县退耕还林以来的植被覆盖度﹑土地利用变化及生态环境质量进行了定量分析,结果表明:2000—2010年植被覆盖度由劣等和差等向中等和良等转变,其中良等盖度面积比例由2010年的2.30%增加到51.30%;主要植被类型中林地面积增长幅度最大,增长面积占土地总面积的23.73%;退耕还林十年间子长县整体生态环境质量得到改善,生态环境质量指数上升0.052 8。

The paper quantitatively analyzed the vegetation coverage,the variation of land use and the quality of ecological environment since returning farmland to forest conducted in Zichang County by taking ETM and remote sensing data in 2000 and 2010 as data source and with the help of the platform of ArcGIS and ERDAS software.The outcomes show that: a) during the period of 2000 to 2010,the vegetation coverage changes from inferior and poor grades to moderate and better grades,of witch,the proportion of coverage area of better grade has been increased from 2.30% in 2010 to 51.30%;b) the extent of increase of forest area among the main vegetation types is the maximum,making up 23.73% of the total land area and;c) during the 10-year period of returning farmland to forest,the overall quality of ecological environment of the county has been improved and the index has been increased by 0.0528.